https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:nuclear-chemistry-hs/x2613d8165d88df5e:nuclear-fusion/v/nuclear-fusion 2024-06-13T01:38:36.313442654Z Nuclear fusion During nuclear fusion, two or more nuclei combine to form a different nucleus. When light nuclei fuse to produce a nucleus lighter than iron, energy is released (exothermic). When heavy nuclei fuse to produce a nucleus heavier than iron, energy is absorbed (endothermic). The release or absorption of energy relates to the difference in total mass of the reactants and products by E=mc^2. Nuclear fusion powers the Sun and other stars. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/6d7d13f4-ecd4-4d6e-a6e8-10fdd18ed56c_1280_720_base.png Nuclear fusion During nuclear fusion, two or more nuclei combine to form a different nucleus. When light nuclei fuse to produce a nucleus lighter than iron, energy is released (exothermic). When heavy nuclei fuse to produce a nucleus heavier than iron, energy is absorbed (endothermic). The release or absorption of energy relates to the difference in total mass of the reactants and products by E=mc^2. Nuclear fusion powers the Sun and other stars. https://cdn.kastatic.org/ka-youtube-converted/b9qxAFLpz9U.mp4/b9qxAFLpz9U.mp4 825 Fission and Fusion https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:nuclear-chemistry-hs/x2613d8165d88df5e:nuclear-fusion/e/understand-nuclear-fusion 2026-05-03T15:00:46.862745588Z Understand: Nuclear fusion Check your understanding of nuclear fusion in this set of free practice questions. Allen Ruch exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:nuclear-chemistry-hs/x2613d8165d88df5e:nuclear-fission/v/nuclear-fission 2024-06-13T01:38:36.313442654Z Nuclear fission During a nuclear fission reaction, a fissile nucleus absorbs a neutron and splits into two smaller nuclei. One or more free neutrons are also released. If enough fissile nuclei are located close enough together, the neutrons released from one fission can induce further fissions, resulting in a chain reaction. Nuclear weapons utilize fast, uncontrolled chain reactions to produce an explosion. Nuclear reactors utilize slower, controlled chain reactions to generate electricity. The release of energy during fission relates to the difference in total mass of the reactants and products by E=mc^2. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/e7bcc5ce-e9e9-4231-9efc-c5ac0aea612f_1280_720_base.png Nuclear fission During a nuclear fission reaction, a fissile nucleus absorbs a neutron and splits into two smaller nuclei. One or more free neutrons are also released. If enough fissile nuclei are located close enough together, the neutrons released from one fission can induce further fissions, resulting in a chain reaction. Nuclear weapons utilize fast, uncontrolled chain reactions to produce an explosion. Nuclear reactors utilize slower, controlled chain reactions to generate electricity. The release of energy during fission relates to the difference in total mass of the reactants and products by E=mc^2. https://cdn.kastatic.org/ka-youtube-converted/5jDFqpoTgDo.mp4/5jDFqpoTgDo.mp4 627 Fission and Fusion https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:nuclear-chemistry-hs/x2613d8165d88df5e:nuclear-fission/e/understand-nuclear-fission 2026-04-28T12:50:36.141790462Z Understand: Nuclear fission Check your understanding of nuclear fission in this set of free practice questions. Allen Ruch exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:nuclear-chemistry-hs/x2613d8165d88df5e:nuclear-fission/e/apply-nuclear-fission 2026-05-03T15:00:46.862745588Z Apply: Nuclear fission Apply your understanding of fission reactions in this set of free practice questions. Allen Ruch exercise https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:energy-resources-and-consumption/x0b0e430a38ebd23f:fuel-types-and-uses-i/v/nuclear-power-generation 2025-08-08T21:39:42.49220884Z Nuclear power generation Nuclear power plants generate electricity by using the heat from nuclear fission to create steam, which spins turbines. This process involves splitting atoms of Uranium-235, a heavy and unstable isotope, in a controlled chain reaction. Nuclear power is considered clean energy because it does not produce air pollutants. The resulting nuclear waste, however, poses significant disposal challenges due to its long-lasting radioactivity. Wieteke Holthuijzen video https://cdn.kastatic.org/ka_thumbnails_cache/4c039f4e-9526-4bf7-8fcb-1ac088ce3800_1280_720_base.png Nuclear power generation Nuclear power plants generate electricity by using the heat from nuclear fission to create steam, which spins turbines. This process involves splitting atoms of Uranium-235, a heavy and unstable isotope, in a controlled chain reaction. Nuclear power is considered clean energy because it does not produce air pollutants. The resulting nuclear waste, however, poses significant disposal challenges due to its long-lasting radioactivity. https://cdn.kastatic.org/ka-youtube-converted/E7UIonbL4FU.mp4/E7UIonbL4FU.mp4 439 Fission and Fusion https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:nuclear-physics/x0e04e0cb682fb793:fission-and-fusion/v/nuclear-reactors-usefulness-and-safety 2026-05-11T04:40:42.021307954Z Nuclear Reactors Usefulness and Safety Nuclear Reactors Usefulness & Safety Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Nuclear Reactors Usefulness and Safety Nuclear Reactors Usefulness & Safety https://cdn.kastatic.org/ka-youtube-converted/-cnLvevFyDo.mp4/-cnLvevFyDo.mp4 465 Fission and Fusion https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:nuclear-physics/x0e04e0cb682fb793:fission-and-fusion/e/nuclear-reactor-usefulness-and-safety 2026-04-28T12:50:36.141790462Z Nuclear Reactor Usefulness and Safety An exercise about Nuclear Powerplants Joel Prakash Stephen exercise